2 |
A.30° | B.45° | C.60° | D.120° |
2 |
a |
sinA |
b |
sinB |
2 |
sin45° |
| ||
sinB |
1 |
2 |
π |
4 |
2 |
1 |
3 |
3 |
A.3
| B.
| C.
| D.
|
A.4 | B.4
| C.4
| D.4
|
A.a=7,b=14,B=30° |
B.a=30,b=40,C=27° |
C.a=3,b=4,c=6 |
D.a=6,b=4,S=8(其中S表示△ABC的面积) |
π |
3 |
2 |
A.有一个解 | B.有两个解 | C.无解 | D.不能确定 |
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